20641372229 has 2 divisors, whose sum is σ = 20641372230. Its totient is φ = 20641372228.

The previous prime is 20641372201. The next prime is 20641372267. The reversal of 20641372229 is 92227314602.

It is a happy number.

It is an a-pointer prime, because the next prime (20641372267) can be obtained adding 20641372229 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17662941604 + 2978430625 = 132902^2 + 54575^2 .

It is a cyclic number.

It is not a de Polignac number, because 20641372229 - 2³² = 16346404933 is a prime.

It is a super-2 number, since 2×20641372229² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20641372192 and 20641372201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20641372429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320686114 + 10320686115.

It is an arithmetic number, because the mean of its divisors is an integer number (10320686115).

Almost surely, 2^20641372229 is an apocalyptic number.

It is an amenable number.

20641372229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20641372229 is an equidigital number, since it uses as much as digits as its factorization.

20641372229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 20641372229 in words is "twenty billion, six hundred forty-one million, three hundred seventy-two thousand, two hundred twenty-nine".